The universe is not expanding from a single point like a bubble - no matter which direction you look out into the universe you are looking straight at the the position of the 'big bang'

As such therefore although the universe as a whole is expanding that doesn't mean that all objects in the universe are moving away from each other.  It is space that is expanding, not the objects within it.

The universe isn't expanding into nothingness - if it were then as we looked out from the Earth there would be fewer stars/galaxies/gas etc. in some directions.  This is not the case, no matter in which direction you look and no matter from where in the universe you look from you will see an even spread of universal objects.  There is no visible edge to the universe.